When you realize you have a flat tire, it's important to find a safe location to change it. Move your car to a level, flat surface away from traffic, turn on your hazard lights, and engage the parking brake.
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Find a safe location
Use a jack to lift the car off the ground and remove the lug nuts with a lug wrench. Then, remove the flat tire and replace it with the spare tire. Tighten the lug nuts by hand as much as possible.
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Remove the flat tire
Use the jack to lower the car back to the ground and remove the jack. Use the lug wrench to fully tighten the lug nuts in a star pattern to ensure even tightening. Finally, check the tire pressure of the spare tire and get the flat tire repaired or replaced as soon as possible.